- Back
-
Title: Trigonometer serving as protractor and parallel rule, steel, [Go to resource]
Description: Trigonometer serving as protractor and parallel rule, steel, patented 8 April 1902 by the Hagan Company, Ellsworth, Maine License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: parallel rules
combined scale protractors
drawing instrumentsTemporal: 1902-1920 Source: Science Museum Identifier: 1988-127 Go to resource More Like this...
[Edit] - Back